On Friday 17 March 2006 22:27, Werner Almesberger wrote: > Blaisorblade wrote: > > 1) I'll try to fix poll(2) to return -EINVAL. Dunno whether anyone will > > say "no, the app is stupid, it deserves no error", but hope not (with > > "try" I refer to this). Attached patch should do this. > > I think the behaviour of "poll" with nfds = 0 is correct as it is. > At least POSIX doesn't say anything to the extent that "nfds" > couldn't be zero:
> http://www.opengroup.org/onlinepubs/009695399/functions/poll.html I don't think that "hanging" is a correct behaviour anyway... unless the application *wanted* to wait for a signal, but this is a clumsy way to do this (I don't think there's any difference from pause()). > Furthermore, this is one of several ways to implement a "sleep" > function with sub-second granularity > , so existing applications > may already depend on "poll" accepting nfds = 0. (Of course, > they would probably be better off using "nanosleep".) This is a very smart note, however usleep(3) exists since 4.3 BSD so this is a bit unlikely; however you're surely right on this. > > 2) write_sigio_thread should do a "down" on a semaphore/mutex and the > > first update_thread should "up" it. > > Yup :-) > > Thanks, > - Werner -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
